Completing The Test; Full Scheme Distance Protection, Mho Characteristic Zmhpdis - ABB Relion 670 Series Commissioning Manual

1MRK 504 165-UEN E
1. Supply the IED with healthy conditions for at least two seconds.
2. Apply the fault condition and slowly decrease the measured impedance to find the
operate value for of the phase-to-earth loop L3, test point 1, according to figure 27.
Compare the result of the measurement with the expected value according to table 22.
The corresponding binary signals that inform about the operation of the phase selection
measuring elements are available in the local HMI under
Main menu/Test/Function status/Impedance Protection/PhaseSelection(PDIS, 21)/
FDPSPDIS:x.
3. Repeat steps
figure
4. Repeat steps
according to figure
11.4.2.2

Completing the test

continue to test another function or end the test by changing the
Restore connections and settings to their original values, if they were changed for testing
purposes.
11.4.3

Full scheme distance protection, mho characteristic ZMHPDIS

Prepare the IED for verification of settings outlined in Section
settings".
Consider releasing of the zone to be tested by setting the phase selector FMPSPDIS to
Keep the current constant when measuring operating characteristics. Keep the current as
close as possible to its rated value or lower. But make sure it is higher than the set minimum
operating current.
Ensure that the maximum continuous current in an IED does not exceed four times its rated
value, if the measurement of the operating characteristics runs under constant voltage
conditions.
To verify the mho characteristic, at least two points should be tested.
In the following, three test points are proposed. The mho characteristic always goes through
the origin, which automatically gives a fourth point for the characteristic.
Transformer protection RET670
Commissioning manual
1 to 2 to find the operate values for the remaining test points according to
27 and table 22.
When the load encroachment characteristic is deliberately set very high in
order not to have an influence, then the test points 2 and 5 can be
replaced by test point 7.
1 to 3 to find the operate value for the phase-to-phase fault in L1 — L2
28 and table 23.
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Testing functionality by secondary injection
TESTMODE setting to Off .
"Preparing the IED to verify
Section 11
M13906-301 v5
M14944-3 v10
On .
113